Autoradiographic Studies With 3H Estradiol in the Body of Lamprey, Ichthyomyzon unicuspis

Reid, F. A., Kim, Y. S., Stumpf, W. E., Selzer, M. E., Sar, M. 1980. Autoradiographic studies with 3H estradiol in the body of lamprey, Ichthyomyzon unicuspis. (Departments of Anatomy and Pharmacology, University of North Carolina, Chapel Hill, North Carolina, and Department of Neurology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, U.S.A.) — Acta zool. (Stockh.) 61 (4): 247–253. Female and male lampreys, Ichthyomyzon unicuspis, in the parasitic feeding stage were injected with 3H estradiol-17β. Autoradiograms were prepared from the trunk region of animals sacrificed 2.5 hours after injection. Nuclei of cells show concentrations of radioactivity which can be abolished with pre-injection of unlabeled estradiol. 3H estradiol-concentrating cells are found in connective tissues associated with aorta, cardinal veins, muscle septa, dermis, intestine, kidney, and ovary, as well as in kidney tubules, epithelial lining of the body cavity, epidermis and notochord. The results demonstrate the extensive presence of estrogen target cells in this cyclostome. These estrogen target sites correspond to tissues known to undergo drastic morphological changes during the spawning migration.

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